diff --git a/docs/requirements_dev.txt b/docs/requirements_dev.txt
index 18ba94b..2499e62 100644
--- a/docs/requirements_dev.txt
+++ b/docs/requirements_dev.txt
@@ -7,7 +7,7 @@ tox==2.9.1
 coverage==4.4.2
 Sphinx==1.6.5
 twine==1.9.1
-cryptography==2.1.4
+cryptography==3.2
 PyYAML==3.11
 sphinx-argparse==0.2.1